Steam-boiler



(No Model.) I 2 Sheets-'Sheet 1.

S. M. VAUCLAIN.

STEAM BOILER.

No. 583,314. Patented May 25,1897;

TNE New: PETERS ca. maraurua, wumnsmu n c 2 Sheets-Sheet 2.

(No Model.)

s. M. VAUGLAIN. STEAM BOILER.

No. 583,314 Patented May 25, 1897.

UNTTED STATES FFIQE.

PATENT STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 583,314, dated May 25, 1897.

Application filed March 8, 1897.

To all whom, it may concern:

Be it known that I, SAMUEL M. VAUCLAIN, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Im provements in Steam-Boilers, of which the following is a specification.

The object of my invention is to improve the construction of the base-section of a locomotive or other boiler, particularly that surrounding the fire-chamber, so as to make a much stronger joint where the plates lap than heretofore and to dispense with the searfing of the plates, which is the usual method employed in locomotive-boiler construction.

In the accompanying drawings, Figure 1 is a sectional View of sufficient of a locomotiveboiler to illustrate my invention. Fig. 2 is a plan view of the base-frame, to which the side plates are secured. Fig. 3 is an enlarged view of one of the corners of the boiler, illustrating my invention. Fig. 4 is a side view of Fig. 3; and Fig. 5 is a section 011 the line 5 5, Fig. 3.

A is the fire-chamber of the boiler, bounded 011 one end by the tube-plate a and at the front by the plate a and at each side by a plate a and surrounding these plates are the plates Z) 1) b forming a water-space B, which communicates with the main water-space B of the boiler.

D is the base frame or ring, to which the several plates are secured by rivets or bolts. It has been the usual practice in securing the plates to this frame D to make the frame perfectly plain without notches and to scarf the edges of the plates where they lap, so as to make a joint which will be about the same thickness as the plates.

In manufacturing boilers in this manner it has been very difficult for the boilermaker to make a neat fit, and the joint is necessarily weak, owing to the scarfing of the two edges of the plates, and, moreover, the joint has to be very carefully calked, otherwise it is liable to leak. Consequently the plates prior to being assembled have to be carefully scarfed and the holes for the rivets bored or punched so as to properly aline, and the boiler when I finished looks more or less crude at this point.

By my invention I am enabled to use plates of even thickness throughout and to trim the Serial No. 626,488. (No model.)

edges on an ordinary shearing-machine"and make the joint, in fact, much stronger than the main body of the boiler.

On referring in the first instance to Fig. 2 it will be noticed that I notch the base-frame D at the four points 61 for the inner plates and at the four points (1 for the outer plates.

In assembling the several plates of the boiler the side plates a are secured to the edge and the notches are of a depth equal to the thickness of the plate, so that when the plate is secured to the frame D its surface will be flush with the surface 61 of the frame, so that when the end plates a a are secured in position their edges will overlap the ends of the plates a, as clearly shown in Figs. 3 and 4t, and when the outer plates are secured to the frame the plates 1) b are bent over and rest in the recess d, and their outer surfaces are flush with the outer surface of the frame, so that when the side plates 1) are placed in position they extend over the edges of the plates Z) l), as clearly shown in Figs. 3 and 4, so that the joint is double the thickness of the other portions of the boiler, and when the plates are riveted together, as shown in Figs. 3, 4,

' and 5, they make a very rigid joint, which can be readily calked and which has a neat appearance.

The notches in the base-plate can be made so perfect that a tight joint can be made between the plates and the frame,

It will be understood that myinvent-ion can be applied to other boilers as well as those of the locomotive type without departing from my invention.

I claim as my invention 1. The combination in a boiler, of the notched frame at the base of the fire-box casing with overlapping plates, the edges of one plate resting in a notch so that the overlap ping plate will fit tightly against the frame and the underlapping plate, substantially as described.

2. The combination in the firebox section of the boiler, of the quadrangular base-frame, having its inner and outer edges notched near the corners, inner end and side plates secured thereto, outer end and side plates secured to the periphery thereof, one set of plates resting in the notches and the other set of plates being secured to the frame and overlapping overlapping the plates Z), Z) at the notches, the aforementioned plates, substantially as the said plates being riveted together and to described. the base-frame, substantially as described.

3. The combination in afire-box section of In testimony whereof I have signed my I5 5 the boiler of a quadrangular base-fra1ne D name to this specification in the presence of having rounded corners and notched at cl, cl two subscribing witnesses.

near the four corners with a tube-plate a a T front plate a, side plates a said side plates SAMUEL AUOLAIN' resting in the notches (Z, while the plates a, a Witnesses:

1o overlap the said plates a outer plates b, b JACOB M. CONNELL,

restin" in the notches cl and side )lates b GEO. H. SIMPKiNs. 

